On Friday, 19 January 2018 at 08:51:00 UTC, Jacob Carlborg wrote:
Not sure I understand this feature. Is it something like:
auto foo = 3;
auto bar = 4;
log(foo, bar);
Would print?
main.d:3 foo=3
main.d:3 bar=4
If that's the case then this seems like yet another hack
because we don't have AST macros.
The above is trivial:
template log(Args...) {
auto log(string file = __FILE__, int line = __LINE__)() {
import std.stdio;
static foreach (arg; Args) {
writeln(file, ":", line, " ", arg.stringof, "=", arg);
}
}
}
unittest {
int foo = 3;
int bar = 4;
log!(foo, bar);
}
What's hard is getting expressions as text:
unittest {
int foo = 3;
int bar = 4;
// Should print 'main.d:5 foo+bar=7'
// but fails to compile with 'variable foo cannot be read at
compile time'
log!(foo + bar);
}
Actually, if we could alias expressions, this should Just Work™.
--
Simen
